Each part has eight time-brackets -with ic program by Andrew Culver (similar to John Cage procedure: change operations) -eleven which are flexible with respect to beginning and ending, and
one, the eight, which is fixed.

1-9 sound(s) or instrument(s) for two no-pitched percussionist(s).

The sounds must be included with the time-bracket.

The dynamic is free: do not play loudly.

Variety as possible in timbre, articulation, rhythm etc.

No allusions to other musical compositions.

The tape is the pre-text for active listening. In this version: PianoChiaro by Fritz Hauser.

Listening very carefully in relation to Inside [I] and Outside [O] of tape PianoChiaro or another piece (in this case the title must be changed).

Inside: the execution must be in relation to the tape (also as partial imitation).

Outside: the execution must not be in relation to the tape (as partial contrast).

The time bracket(s) are unique to the two interpreters / improvisers. Every fork of time must always be understood as a duo. The times between the bracket(s) are understood as only. These times /
spaces in solo do not have to be agreed before but reached during the improvisation through the listening and the immersion in the sound landscape in the total duration of 22:27 and 18:46. There
must be a pause of at least 5 seconds between the first and second part. In the first part the time brackets in (5:16 to 7:27) / (6:02 to 9:01) are chosen, always as a duo.